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In measurement systems, accuracy generally refers to the closeness of a measured value and the true value. All measurements are subjected to both systematic (bias) and random errors to differing degrees, and consequently the true value can only be estimated.
A particular measurement and measurement instrument may be highly repeatable (or precise) but in error (i.e. not accurate). Systematic or bias errors may arise from either the observer or the instrument. They may be constant or vary in some regular way. An example of a source of systematic error is a pressure gauge needle (i.e. not zeroed).
The monitoring system should detect, measure, understand and integrate the readings, and respond properly.
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